卵黄囊

词型变化：名词复数形式 : yolk-sacs

yolk-sac的用法和样例：

例句

The yolk sac is gradually vascularized.卵黄囊逐渐被血管化了。
The dye Trypan Blue has a remarkable biphasic effect on pinocytosis by yolk sal.染料锥虫蓝对卵黄囊的胞饮作用具有明显的双向作用。

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